// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Simple stack backtrace regression test module
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*
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* (C) Copyright 2008 Intel Corporation
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* Author: Arjan van de Ven <arjan@linux.intel.com>
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*/
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#include <linux/completion.h>
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#include <linux/delay.h>
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#include <linux/interrupt.h>
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#include <linux/module.h>
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#include <linux/sched.h>
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#include <linux/stacktrace.h>
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static void backtrace_test_normal(void)
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{
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pr_info("Testing a backtrace from process context.\n");
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pr_info("The following trace is a kernel self test and not a bug!\n");
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dump_stack();
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}
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static DECLARE_COMPLETION(backtrace_work);
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static void backtrace_test_irq_callback(unsigned long data)
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{
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dump_stack();
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complete(&backtrace_work);
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}
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static DECLARE_TASKLET_OLD(backtrace_tasklet, &backtrace_test_irq_callback);
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static void backtrace_test_irq(void)
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{
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pr_info("Testing a backtrace from irq context.\n");
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pr_info("The following trace is a kernel self test and not a bug!\n");
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init_completion(&backtrace_work);
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tasklet_schedule(&backtrace_tasklet);
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wait_for_completion(&backtrace_work);
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}
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#ifdef CONFIG_STACKTRACE
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static void backtrace_test_saved(void)
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{
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unsigned long entries[8];
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unsigned int nr_entries;
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pr_info("Testing a saved backtrace.\n");
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pr_info("The following trace is a kernel self test and not a bug!\n");
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nr_entries = stack_trace_save(entries, ARRAY_SIZE(entries), 0);
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stack_trace_print(entries, nr_entries, 0);
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}
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#else
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static void backtrace_test_saved(void)
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{
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pr_info("Saved backtrace test skipped.\n");
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}
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#endif
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static int backtrace_regression_test(void)
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{
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pr_info("====[ backtrace testing ]===========\n");
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backtrace_test_normal();
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backtrace_test_irq();
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backtrace_test_saved();
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pr_info("====[ end of backtrace testing ]====\n");
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return 0;
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}
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static void exitf(void)
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{
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}
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module_init(backtrace_regression_test);
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module_exit(exitf);
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("Arjan van de Ven <arjan@linux.intel.com>");
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